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Method and apparatus for removing dental caries by using laser radiation

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US6083218A
US6083218A US08676695 US67669596A US6083218A US 6083218 A US6083218 A US 6083218A US 08676695 US08676695 US 08676695 US 67669596 A US67669596 A US 67669596A US 6083218 A US6083218 A US 6083218A
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laser
beam
water
target
coolant
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US08676695
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Mau-Song Chou
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Northrop Grumman Systems Corp
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Northrop Grumman Space and Mission Systems Corp
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/0046Dental lasers

Abstract

An apparatus (1) is provided for treating a target area (22) of a tooth (10). The apparatus (1) generally comprises a coolant delivery system (20) and an ultraviolet laser system (15). The coolant delivery system (20) delivers coolant (52) to the target area (22) while a light guide (44) focuses ultraviolet radiation thereon. The ultraviolet radiation (18) and coolant (52) combine to ablate a desired material without generating excess heat which may otherwise char surface tissue or cause thermal damage.

Description

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention generally relates to an apparatus and method for removing plaque and decay tissue, commonly known as dental caries, using laser radiation. More particularly, the present invention relates to an apparatus using ultraviolet radiation and a coolant to ablate a desired material from a tooth without generating excess heat at the target site or surrounding areas.

2. Discussion

As is generally known in the art of dentistry, conventional drilling machines for treating dental caries such as plaque and decay tissue can be inaccurate and painful. Therefore, it is desirable to replace or support conventional drilling machines with lasers in order to achieve a more accurate and painless treatment of caries. However, laser irradiation processes currently available often produce charring on the target surface and surrounding areas due to laser generated heat. The blackened char tissue effectively blocks the laser radiation thereby preventing it from reaching biological tissue thereunder. Thus, charring due to excess heat interrupts the ablation process.

Excess heat may also produce cracks in the tooth surface and damage the nerve system and other pulp structure in the pulp chamber irreversibly. Accordingly, laser treatment of hard tissue, including caries removal, has not yet achieved practical dental application due to the thermal damage related to laser generated heat. Therefore, it is desirable to provide an apparatus and method for treating dental caries using laser irradiation which does not generate sufficient heat to cause thermal damage.

In conventional dental surgery using drilling machines, water is commonly used to dissipate heat and remove debris from a work area. Water has also been used in laser dental surgery for the removal of excess heat after irradiation of a target area with laser pulses. For example, Vassiliadis, et al. (U.S. Pat. No. 4,940,411) discloses a dental laser method using a Neodymium doped Yttrium-Aluminum-Garnet (Nd:YAG) infrared laser.

Vassiliadis, et al. teach spraying water on a tooth following each laser pulse. Thereafter, the tooth is dried prior to a subsequent pulse from the laser. This teaching conforms with studies concerning infrared laser treatment of dental caries which stress the need to keep the tooth dry during delivery of laser pulses in order to minimize attenuation of the laser by the water. During infrared laser treatment, water has to be nearly absent due to the laser being strongly absorbed. A drying means, such as an air sprayer is generally used to dry the tooth surface before a subsequent laser pulse is applied.

On the other hand, Wolbarsht, et al. (U.S. Pat. No. 5,267,856) discloses that a thin layer of water entering the surface pores or chemically held on the surface of the tooth can enhance the removal rate of desired material when using an Erbium doped Yttrium-Aluminum-Garnet (Er:YAG) infrared laser. Wolbarsht stresses that the water should not be permitted to remain pooled on the tooth surface in this process because of the inability of the infrared radiation to penetrate thick layers of water effectively. Therefore, the thickness of the water layer must be critically controlled during the process.

One problem with infrared lasers is that they are not selective in treating carious tissue without effecting dentine and enamel. Furthermore, infrared laser light cannot penetrate through water except over relatively short distances. Therefore, infrared processes exclude the use of a relatively thick layer of water spray to achieve effective cooling. Accordingly, it is desirable to provide a laser which is selective in removing carious material and which penetrates thick layers of water. In this way, water can be sprayed on the tooth surface in a non-critically controlled manner such that it may pool or form a thick layer thereon which is effective to prevent charring of tissue. Furthermore, the thick layer of water provides a greater cooling effect and allows use of greater laser fluence which improves the ablation process rate.

SUMMARY OF THE INVENTION

An apparatus is provided for treating a target area of a tooth. The apparatus generally comprises a coolant delivery system and an ultraviolet laser. The coolant delivery system delivers coolant to the target area while a light guide focuses the ultraviolet radiation thereon. The laser and coolant combine to ablate a desired material without generating excess heat which may char surface tissue or cause thermal damage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an apparatus for removing dental caries such as plaque and decay tissue including an ultraviolet laser and a coolant in accordance with the present invention.

FIG. 2 is a more detailed schematic view of the apparatus of FIG. 1.

FIG. 3 is a detailed schematic view of the coolant delivery system of FIG. 1.

FIG. 4 is a detailed schematic view of the suction system of FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention provides an apparatus and method for removing dental caries such as plaque, decay tissue and lesions using ultraviolet laser radiation and a coolant. The use of laser radiation enables a more accurate and painless treatment of caries than conventional drilling machines. The present invention effectively removes dental caries from hard surfaces and prevents charring of tissue at the target area by preventing excess heat from being generated. By preventing charring of tissue at the target area, the ablation process can be executed without interruption. Also, the potential for dentine or enamel cracking as well as damage to the nerve system and other pulp structure in the pulp chamber is greatly reduced by preventing excess heat from being generated at the target and surrounding areas. Furthermore, the thickness of the coolant layer on the tooth surface does not need to be critically controlled. Thus, the coolant used in the present invention may remain pooled on the tooth surface during laser irradiation. Moreover, a drying step, as required in previous processes, is eliminated.

In FIG. 1, an apparatus for removing dental caries, such as plaque and decay tissue, implementing the present invention is shown generally at 1. A tooth 10 having carious material or decay tissue 12 located thereon is shown protruding from a gum 14. A laser system 15 is provided to serve as a source of ultraviolet radiation 18 for the apparatus 1. A coolant delivery system, generally indicated at 20, is provided for delivering coolant to the target area 22. A suction system, indicated at 24, is provided for collecting excess coolant and debris from the target area 22.

Referring now to FIG. 2, the present invention utilizes an ultraviolet laser generator 16 to generate pulsed ultraviolet radiation 18 having a wavelength generally less than 600 nm. The ultraviolet laser generator 16 of the present invention may be set to operate at a predetermined fluence to selectively ablate a single target material since healthy enamel 26, healthy dentin 28, and carious lesions 12 each have different energy fluence thresholds for ablation, as well as different absorption coefficients which describe the characteristic depths to which ultraviolet radiation 18 is absorbed. The use of the ultraviolet laser generator 16 advantageously permits selective ablating of caries 12 while leaving healthy dentin 28 and enamel 26 essentially unaffected.

Furthermore, a conventional control panel 32 provides means for adjusting the frequency, energy, and duration of the pulses of radiation 18 generated by the laser 16. An activation switch 34 is coupled between the laser 16 and a power supply 36 to activate the laser 16.

The laser generator 16 preferably produces a pulsed output beam 30 with a pulse repetition rate of from about 0.1 to about 10,000 pulses per second and laser energy of about 0.1 millejoules per pulse to 5 joules per pulse. In addition, the laser 16 has a wavelength approximately between 193-600 nm which has been shown to be particularly effective in eradicating caries 12. The diameter of the output beam 30 at the target area 22 is preferably between 0.1 mm to 5 mm.

Although not to be interpreted as limiting, the following lasers have been found to be particularly useful in conjunction with the present invention: Argon-Fluoride (ArF) at approximately 193 nm; Krypto-Fluoride (KrF) at approximately 249 nm; Xenon-Chloride (XeCl) at approximately 305 nm; Xenon-Fluoride (XeF) at approximately 352 nm and frequency tripled Neodymium doped Yttrium-Aluminum-Garnet (Nd:YAG) at approximately 355 nm.

Conventional optics 38 such as mirrors, lenses or prisms are optionally employed to direct the radiation 18 from the laser 16 to a lens 40. The lens 40 directs and focuses the radiation 18 into one end 42 of a light guide 44. It should be noted that the lens 40 can include more than one element and can be shaped to any number of configurations and focal lengths as desired. Furthermore, an optical output connector (not shown) can be interposed between the laser 16 and the light guide 44 if desired.

The light guide 44, which may be an optical fiber or a conventional mirror and lens system, is provided to direct and transfer the radiation 18 along its interior to an exit end 46. In the preferred embodiment, an optical fiber is used since its flexibility and ease of positioning facilitates operation within the confines of a human mouth. Preferably, a triple frequency Nd:YAG laser is employed when an optical fiber is used.

The exit end 46 is preferably shaped so as to concentrate or focus the output beam 30 exiting therefrom. Alternately, a lens may be attached to the exit end 46 for this purpose. In either case, it is desirable to provide a relatively short focal length at the exit end 46 for most dental applications. The output beam 30 exiting from the exit end 46 is used to ablate carious material 12. It should be noted that the light guide 44 may be incorporated into a hand piece at its free end 48 so as to provide ease of operation for a dentist.

In the preferred embodiment of the present invention, a low power laser 100 operating in the visible spectrum is incorporated into the laser system 15. Helium Neon or Diode lasers are suitable for this purpose. A guide beam 102 exiting the low power laser 100 travels through the light guide 44 so as to be substantially coincident with the output beam 30 when projected from the exit end 46. In this way, the output beam 30 can be guided to the target area 22 by observing the position of the guide beam 102. In the case when the low power laser 100 is not used, the operator may observe visible fluorescence on the target area 22 induced by the radiation 18 for an indication that the output beam 30 is properly positioned.

Turning now to FIG. 3, a coolant reservoir 50 is provided for storing coolant, preferably in the form of water 52 cooled to a temperature in the range of 15° C. to 30° C. to be applied to the tooth 10. A tube or supply line 54 is coupled at a first end 56 through a connection means 58 to the coolant reservoir 50. The tube 54 is positionable for directing water 52 from an exit end 60 to the target area 22. The water 52 may be delivered intermittently or preferably continuously over the tooth 10. Known water delivery systems such as a conventional air/water dental handpiece as found in most dental offices can be used effectively for this purpose.

It should be noted that although the coolant preferably comprises water 52 in the form of a spray, other coolants may be used. It is also preferable that distilled or deionized water 52 be utilized with lower wavelength lasers such as the ArF laser so as to minimize the level of contaminants which may absorb the laser radiation 18. However, the preference for distilled or deionized water 52 decreases as the wavelength of the laser 16 increases.

Referring to FIG. 4, a suction tube 62 is provided for removing excess water 52 and debris 64 from the target area 22. The suction tube 62 has a first end 66 adapted for collecting and delivering excess water 52 to an elongated body portion 68. The suction tube 62 also includes an exit end 70 which is coupled by a connection means 72 to a waste system 74. Conventional suction systems as found in most dental offices are preferred for this purpose.

In operation, the low power laser 100 is activated so as to cause the guide beam 102 to exit the light guide 44. Next, the free end 48 of the light guide 44 is maneuvered to aim the exit end 46 generally at a predetermined target area 22 having decay tissue, plaque or lesion 12 thereon. Proper aiming is indicated by the guide beam 102 impinging upon the target area 22.

After properly positioning the guide beam 102, the coolant delivery system 20 is operated so as to spray a layer of water 52 on the surface of the tooth 10. The suction system 24 is then operated so as to collect excess water 52. Next, the laser 16 is activated to produce ultraviolet radiation 18. Since the output beam 30 is substantially coincident with the guide beam 102 it impinges upon the target area 22. Finally, the light guide 44 is maneuvered as desired to cause the output beam 30 to impinge upon selected portions of the target area 22.

In accordance with the invention, the output beam 30 passes through the layer of water 52 to eradicate a desired material 12 located beneath the water 52. The water 52 is collected by the suction system 24 during ablation when necessary or continuously to prevent buildup of debris 64 and water 52.

The water 52 may be sprayed continuously so as to pool or form a thick layer on the tooth 10 during laser treatment because of the relatively weak absorption of radiation 18 by water 52 in the ultraviolet spectral region. It should be noted that the water 52 is much more effective in removing excess heat if it is sprayed on the tooth 10 simultaneously during laser irradiation. Preferably, the laser pulse duration, energy level and frequency are set prior to the ablation process. However, these parameters may be adjusted during the procedure if desired. For instance, a quicker rate of ablation may be achieved by increasing the laser energy level. The optimal fluence level for removing carious tissue 12 without causing thermal damage to surrounding areas has been found to be approximately 0.07 to 10 J/cm2. Furthermore, the optimal wavelength and frequency are in the range of 193 nm-400 nm and 1-20 Hz respectively.

In the examples to follow an ArF laser was used with water as a coolant from a distilled water reservoir. Continuous water flow was used over the surface of the treated area, in this case, extracted teeth.

EXAMPLE 1

An ArF laser at fluence as low as approximately 90 mJ/cm2 was caused to impinge upon carious tissue on the surface of a dry extracted tooth. Charred tissue was quickly produced and the ablation rate was found to decrease drastically thereafter. Additional experiments were performed by using a N2 purge flow as coolant. Although there were some improvements gained by use of N2 at a relatively high flow rate, N2 did not prevent charring of the tissue effectively.

EXAMPLE 2

Example 1 was repeated except that distilled water was used as coolant. The water was flowed from the tip of a tube connected to a distilled water reservoir. Pooled water was formed on the tooth surface by continuous flow of the water. An unfocused excimer laser beam (ArF laser at 193 nm) was apertured to approximately a 1 mm-diameter beam size and was caused to penetrate through the pooled water onto the decayed tissue. The laser repetition rate was varied from 10 to 20 Hz. Under these conditions, no charred tissue was observed for a fluence up to approximately 230 mJ/cm2 for a duration of up to approximately 6 minutes. The ablation (recession) rate was measured to be approximately 0.35 micrometers per pulse at a laser fluence of 200 mJ/cm2, operating at 20 Hz. The recession was approximately 2.6 mm for a duration of up to approximately 6 minutes.

EXAMPLE 3

Thermocouples were used to measure the surface temperature of the surrounding area and the pulp chamber during laser irradiation. In the absence of water cooling, the temperature in the surrounding area increased by 9° C. in 3 minutes at laser fluence of 200 mJ/cm2 and laser repetition rate of 20 Hz. In the presence of water flow under similar laser irradiation conditions, the temperature rise was less than 1° C. near the irradiation area and essentially no measurable temperature rise at the pulp chamber.

One advantage of the current invention is that water spray may be used without critically controlling the thickness of the layer of water as required in infrared laser procedures since ultraviolet radiation is not absorbed strongly by water. Furthermore, a continuous flow of water can be utilized thereby alleviating the need to dry the target area between pulses of radiation. Another advantage is that a thick layer of water is highly effective in preventing thermal damage at the target site, surrounding areas and in the pulp chamber since excess heat is prevented from being generated. Charring is also alleviated with water cooling and allows the uninterrupted use of higher laser power which increases the penetration depth per pulse and ablation rate. In addition, an ultraviolet laser is highly effective in selectively ablating carious material while leaving healthy dentine and enamel tissue unaffected.

Those skilled the art can now appreciate from the foregoing description that the broad teachings of the present invention can be implemented in a variety of forms. Therefore, while this invention has been described in connection with particular examples thereof, the true scope of the invention should not be so limited since other modifications will become apparent to those skilled practitioners upon a study of the drawings, specification and following claims.

Claims (18)

What is claimed is:
1. An apparatus for removing pre-selected dental caries from non-selected healthy dental tissue at a predetermined target site of a tooth comprising:
a laser source for generating an ultraviolet laser beam having a wavelength in a range of 193 nm-400 nm;
a fluid coolant delivery handpiece coupled to a water reservoir for delivering a fluid coolant for dissipating heat to said target site such that said fluid coolant has an arbitrary thickness between said laser beam and said preselected dental caries and said non-selected healthy dental tissue; and
an optical device disposed in radiation receiving relation to said laser source for delivering said laser beam to said target site, said laser beam propagating through said fluid coolant and ablating said pre-selected dental caries, said fluid coolant coacting with said laser beam to maintain a temperature at said target site below a given threshold temperature as said pre-selected dental caries are removed by said laser beam.
2. The apparatus of claim 1 further comprising a low power laser generator for generating a laser guide beam having a wavelength in the visible spectrum, said laser guide beam being directed so as to coincide with said laser beam at said target site for providing a visible reference for directing said laser beam.
3. The apparatus of claim 1 further comprising a vacuum means for removing said fluid coolant and pre-selected dental caries from said target site.
4. The apparatus of claim 1 wherein said optical device includes a radiation emitting end for focusing said laser beam to a desired diameter at said target site.
5. The apparatus of claim 1 wherein said optical device further comprises a fiber optic wave guide having a first end and a second end, said first end optically communicating with said laser source for receiving said laser beam therein, and said second end being positionable to said target site and operable for focusing said laser beam to a desired diameter at said target site.
6. The apparatus of claim 1 wherein said wavelength of said laser beam is in a range of 240 nm-400 nm.
7. The apparatus of claim 1 wherein said laser beam comprises an Nd:YAG laser beam having a wavelength in a range of 260-360 nm.
8. The apparatus of claim 1 wherein said laser beam has a fluence level in a range of 0.01-10 J/cm2 at said target site.
9. The apparatus of claim 1 wherein said laser beam has a frequency level in a range of 1-1000 Hz.
10. The apparatus of claim 1 wherein said laser beam has a diameter at said target site in a range of 0.1 mm-5 mm.
11. The apparatus of claim 1 wherein said fluid coolant comprises water.
12. A method of removing pre-selected dental caries from non-selected healthy dental tissue at a target site of a tooth comprising:
delivering a fluid coolant for dissipating heat to said target site such that said fluid coolant forms a layer having an arbitrary thickness on said preselected dental caries and said non-selected healthy dental tissue;
generating a laser beam having a wavelength in a range of 193 nm-400 nm; and
delivering said laser beam to said target site, said laser beam propagating through said fluid coolant and ablating said pre-selected dental caries, said fluid coolant coacting with said laser beam to maintain a temperature at said target site below a given threshold temperature.
13. The method of claim 12 further comprising:
generating a low power laser guide beam having a wavelength in the visible spectrum and directing said low power laser guide beam so as to be coincident with said laser beam at said target site.
14. The method of claim 12 further comprising:
removing said fluid coolant and aid pre-selected dental caries from said target site with a vacuum after said laser beam ablates said pre-selected material.
15. The method of claim 12 further comprising:
focusing said laser beam to a given diameter at said target site.
16. The method of claim 12 wherein said step of generating said laser beam includes generating an Nd:YAG laser beam having a wavelength in a range of 260 nm-360 nm.
17. A method of ablating pre-selected dental caries from a non-selected healthy dental tissue at a target site of a tooth comprising:
delivering water for dissipating heat to said target site such that said water forms a layer having an arbitrary thickness on said preselected caries an non-selected tissue;
generating a laser beam having a wavelength in a range of 193 nm-400 nm, a fluence level in a range of 0.01-10 J/cm2 and a frequency level in a range of 1-1000 Hz;
generating a low power laser guide beam having a wavelength in the visible spectrum, said low power laser guide beam being coincident with said laser beam at said target site;
delivering said low power guide beam and said laser beam to said target site through a fiber optic waveguide, said waveguide focusing said laser beam to a diameter in a range of 0.1 nm-5 nm at said target site, said laser beam propagating through said water and ablating said pre-selected caries from said non-selected healthy dental tissue at said target site, said water coacting with said laser beam to maintain a temperature at said target site below a given threshold temperature; and
removing said water and pre-selected caries from said target site with a vacuum after said laser beam ablates said pre-selected caries.
18. The method of claim 17 wherein said step of generating said laser beam includes generating an Nd:YAG laser beam at a wavelength in a range of 260-360 nm.
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EP19970111067 EP0818181A1 (en) 1996-07-10 1997-07-02 Method and apparatus for removing dental caries by using laser radiation
CN 97114662 CN1182573A (en) 1996-07-10 1997-07-10 Method and apparatus for cutting off dental caries by laser radiation
JP18558097A JPH1057400A (en) 1996-07-10 1997-07-10 Apparatus to remove caries using laser

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Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6254389B1 (en) * 1999-09-20 2001-07-03 Marc Seghatol Hand-held microwave intra-oral dental system
US6558372B1 (en) * 1998-01-23 2003-05-06 Gregory B. Altshuler Method for treating materials, especially biological tissues, using light induction and device for realizing the same
US6605651B1 (en) 1998-09-09 2003-08-12 Biomat Sciences, Inc. Curing methods and material compositions having dental and other applications
US20040030326A1 (en) * 2002-04-09 2004-02-12 Altshuler Gregory B. Method and apparatus for processing hard material
US6709269B1 (en) * 2000-04-14 2004-03-23 Gregory B. Altshuler Apparatus and method for the processing of solid materials, including hard tissues
US20040156743A1 (en) * 2002-08-28 2004-08-12 Eric Bornstein Near infrared microbial elimination laser system
US20040170060A1 (en) * 2003-02-27 2004-09-02 Renesas Technology Corp. Semiconductor storage device preventing data change due to accumulative disturbance
US20040188400A1 (en) * 2001-09-10 2004-09-30 Micron Technology, Inc. Wafer dicing device and method
US20040221451A1 (en) * 2003-05-06 2004-11-11 Micron Technology, Inc. Method for packaging circuits and packaged circuits
US20050015124A1 (en) * 2000-10-20 2005-01-20 Irwin Dean S. Treatment of skin disorders with UV light and cooling
US20050011885A1 (en) * 1998-09-18 2005-01-20 Marc Seghatol Hand-held microwave polymerization system for dentistry
US20050123490A1 (en) * 2003-12-04 2005-06-09 Kazue Yamagishi Composition and method for prevention and treatment of dental caries
US20050170310A1 (en) * 2002-06-10 2005-08-04 Olaf Schafer Medical tools for dental treatments by means of a laser
WO2005070151A2 (en) 2004-01-08 2005-08-04 Biolase Technology, Inc. Electromagnetic energy distributions for electromagnetically induced mechanical cutting
US20050177208A1 (en) * 2001-10-18 2005-08-11 Irwin Dean S. Device for oral UV photo-therapy
WO2005087317A1 (en) * 2003-08-26 2005-09-22 Eric Bornstein Near infrared microbial elimination laser system
US20050281887A1 (en) * 1995-08-31 2005-12-22 Rizoiu Ioana M Fluid conditioning system
US20060021977A1 (en) * 2004-07-30 2006-02-02 Menegus Harry E Process and apparatus for scoring a brittle material incorporating moving optical assembly
US20060033963A1 (en) * 2004-08-10 2006-02-16 Hirobumi Nishida Image processing device, image processing method, image processing program, and recording medium
US7048731B2 (en) 1998-01-23 2006-05-23 Laser Abrasive Technologies, Llc Methods and apparatus for light induced processing of biological tissues and of dental materials
US20060126680A1 (en) * 2004-07-27 2006-06-15 Dmitri Boutoussov Dual pulse-width medical laser
US20060142745A1 (en) * 2004-08-13 2006-06-29 Dmitri Boutoussov Dual pulse-width medical laser with presets
US20060142743A1 (en) * 2004-07-27 2006-06-29 Rizoiu Ioana M Medical laser having controlled-temperature and sterilized fluid output
US20060189091A1 (en) * 2004-11-11 2006-08-24 Bo Gu Method and system for laser hard marking
US20060240381A1 (en) * 1995-08-31 2006-10-26 Biolase Technology, Inc. Fluid conditioning system
US20060241574A1 (en) * 1995-08-31 2006-10-26 Rizoiu Ioana M Electromagnetic energy distributions for electromagnetically induced disruptive cutting
US20070014322A1 (en) * 1995-08-31 2007-01-18 Biolase Technology, Inc. Electromagnetic energy distributions for electromagnetically induced mechanical cutting
US20070265605A1 (en) * 2006-05-15 2007-11-15 Light Instruments Ltd. Apparatus and method for treating dental tissue
US20080003536A1 (en) * 2002-04-09 2008-01-03 Altshuler Gregory B Method and apparatus for processing hard material
US7320594B1 (en) 1995-08-31 2008-01-22 Biolase Technology, Inc. Fluid and laser system
US20080032251A1 (en) * 2006-07-19 2008-02-07 Mau-Song Chou Laser carious region ablation
US20080157690A1 (en) * 2001-05-02 2008-07-03 Biolase Technology, Inc. Electromagnetic energy distributions for electromagnetically induced mechanical cutting
US20090105790A1 (en) * 2002-08-28 2009-04-23 Nomir Medical Technologies, Inc. Near Infrared Microbial Elimination Laser Systems (NIMELS)
US20090141752A1 (en) * 2004-07-27 2009-06-04 Rizoiu Ioana M Dual pulse-width medical laser with presets
US20090143775A1 (en) * 1995-08-31 2009-06-04 Rizoiu Ioana M Medical laser having controlled-temperature and sterilized fluid output
US20090281531A1 (en) * 1995-08-31 2009-11-12 Rizoiu Ioana M Interventional and therapeutic electromagnetic energy systems
US20090319008A1 (en) * 2005-03-31 2009-12-24 Esther Mayer Probe device, system and method for photobiomodulation of tissue lining a body cavity
US20100092908A1 (en) * 2008-10-10 2010-04-15 W&H Dentalwerk Burmoos Gmbh Medical handpiece with pulsed illumination
US20100125291A1 (en) * 1995-08-31 2010-05-20 Rizoiu Ioana M Drill and flavored fluid particles combination
US20100140794A1 (en) * 2001-10-08 2010-06-10 Chia Yong Poo Apparatus and method for packaging circuits
US20100151406A1 (en) * 2004-01-08 2010-06-17 Dmitri Boutoussov Fluid conditioning system
US20110018143A1 (en) * 2002-06-14 2011-01-27 Swee Kwang Chua Wafer level packaging
US20130216972A1 (en) * 2010-07-22 2013-08-22 Laszlo Kolozsvary Process and apparatus for computer-controlled preparation of teeth
US20140030671A1 (en) * 2011-06-01 2014-01-30 Hamamatsu Photonics K.K. Dental therapy apparatus
US9011417B2 (en) 2012-05-14 2015-04-21 Convergent Dental, Inc. Apparatus and method for controlled fluid cooling during laser based dental treatments
US20150140504A1 (en) * 2013-11-19 2015-05-21 Sirona Dental Systems Gmbh Soft-tissue laser surgery
US20150374471A1 (en) * 2013-02-01 2015-12-31 Biomat Sciences Method and device for treating caries using locally delivered microwave energy
US9408673B2 (en) 2011-09-02 2016-08-09 Convergent Dental, Inc. Laser based computer controlled dental preparation system
US9539057B2 (en) 2012-04-26 2017-01-10 J. Morita Manufacturing Corporation Laser irradiation tip, laser irradiation handpiece, laser treatment apparatus, and laser irradiation tip end member

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001058398A1 (en) * 2000-02-14 2001-08-16 Q-Vis Limited Improved apparatus and procedure for ultraviolet laser ablation
US7090669B2 (en) 2000-02-14 2006-08-15 Paul Phillip Van Saarloos Apparatus and procedure for ultraviolet laser ablation
CA2385981A1 (en) 2002-05-08 2003-11-08 Neks Recherche & Developpement Inc. Device and method to detect dental caries
DE102010026288A1 (en) * 2010-07-06 2012-01-12 Yong-min Jo System for material removal in the mouth
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5112328A (en) * 1988-01-25 1992-05-12 Refractive Laser Research & Development Program, Ltd. Method and apparatus for laser surgery
US5116227A (en) * 1991-03-01 1992-05-26 Endo Technic Corporation Process for cleaning and enlarging passages
US5123902A (en) * 1988-09-13 1992-06-23 Carl-Zeiss-Stiftung Method and apparatus for performing surgery on tissue wherein a laser beam is applied to the tissue
US5180304A (en) * 1988-08-25 1993-01-19 American Dental Laser, Inc. Method for apical fusion of the foramina
US5199870A (en) * 1989-04-11 1993-04-06 Aesculap Ag Process for destroying and removing material from teeth
US5281141A (en) * 1992-03-16 1994-01-25 Medical Laser Technology, Inc. Dental laser apparatus and method for treating tooth decay
US5324200A (en) * 1988-08-25 1994-06-28 American Dental Technologies, Inc. Method for enlarging and shaping a root canal
US5342198A (en) * 1988-03-14 1994-08-30 American Dental Technologies, Inc. Dental laser
US5435724A (en) * 1993-03-04 1995-07-25 International Business Machines Corporation Dental procedures and apparatus using ultraviolet radiation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5192279A (en) * 1989-08-08 1993-03-09 Samuels Mark A Dental tissue cutting, drilling and fusing system
US5267856A (en) * 1991-09-20 1993-12-07 Premier Laser Systems, Inc. Laser surgical method
DE4339488A1 (en) * 1993-11-19 1995-05-24 Rechmann Peter Dr Med Dent Handpiece, and methods for flushing the operating point of an outgoing from a light guide the laser light beam

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5112328A (en) * 1988-01-25 1992-05-12 Refractive Laser Research & Development Program, Ltd. Method and apparatus for laser surgery
US5342198A (en) * 1988-03-14 1994-08-30 American Dental Technologies, Inc. Dental laser
US5180304A (en) * 1988-08-25 1993-01-19 American Dental Laser, Inc. Method for apical fusion of the foramina
US5324200A (en) * 1988-08-25 1994-06-28 American Dental Technologies, Inc. Method for enlarging and shaping a root canal
US5123902A (en) * 1988-09-13 1992-06-23 Carl-Zeiss-Stiftung Method and apparatus for performing surgery on tissue wherein a laser beam is applied to the tissue
US5199870A (en) * 1989-04-11 1993-04-06 Aesculap Ag Process for destroying and removing material from teeth
US5116227A (en) * 1991-03-01 1992-05-26 Endo Technic Corporation Process for cleaning and enlarging passages
US5281141A (en) * 1992-03-16 1994-01-25 Medical Laser Technology, Inc. Dental laser apparatus and method for treating tooth decay
US5435724A (en) * 1993-03-04 1995-07-25 International Business Machines Corporation Dental procedures and apparatus using ultraviolet radiation

Non-Patent Citations (9)

* Cited by examiner, † Cited by third party
Title
Arima, et al., Effects of ArF excimer laser irradiation on human enamel and dentine, Lasers in Surgery and Medicine 13 97 to 105 (1993). *
Frentzen, et al., "Excimer lasers in dentistry: future possibilities and advanced technology," Quintessence International 23, 117 to 133 (1992).
Frentzen, et al., Excimer lasers in dentistry: future possibilities and advanced technology, Quintessence International 23, 117 to 133 (1992). *
Henning, et al., "Caries selective ablation by pulsed lasers," SPIE 1424, pp. 99-105 (1991).
Henning, et al., Caries selective ablation by pulsed lasers, SPIE 1424, pp. 99 105 (1991). *
Neev, et al., "Selectivity, efficiency, and surface characteristics of hard dental tissues ablated with ArF pulsed excimer lases," Lasers in Surgery and Medicine 11, 499 to 510 (1991).
Neev, et al., Selectivity, efficiency, and surface characteristics of hard dental tissues ablated with ArF pulsed excimer lases, Lasers in Surgery and Medicine 11, 499 to 510 (1991). *
Selective Absorption of Ultraviolet Laser Energy by Human Atherosclerotic Plaque Treated with Tetracyclines by Murphy Chutorian et al; Am. J. Cardiol; vol. 55; May 1985; pp 1293 1297. *
Selective Absorption of Ultraviolet Laser Energy by Human Atherosclerotic Plaque Treated with Tetracyclines by Murphy-Chutorian et al; Am. J. Cardiol; vol. 55; May 1985; pp 1293-1297.

Cited By (93)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080151953A1 (en) * 1995-08-31 2008-06-26 Biolase Technology, Inc. Electromagnet energy distributions for electromagnetically induced mechanical cutting
US7696466B2 (en) 1995-08-31 2010-04-13 Biolase Technology, Inc. Electromagnetic energy distributions for electromagnetically induced mechanical cutting
US20100125291A1 (en) * 1995-08-31 2010-05-20 Rizoiu Ioana M Drill and flavored fluid particles combination
US20050281887A1 (en) * 1995-08-31 2005-12-22 Rizoiu Ioana M Fluid conditioning system
US20060240381A1 (en) * 1995-08-31 2006-10-26 Biolase Technology, Inc. Fluid conditioning system
US8033825B2 (en) 1995-08-31 2011-10-11 Biolase Technology, Inc. Fluid and pulsed energy output system
US20060241574A1 (en) * 1995-08-31 2006-10-26 Rizoiu Ioana M Electromagnetic energy distributions for electromagnetically induced disruptive cutting
US7320594B1 (en) 1995-08-31 2008-01-22 Biolase Technology, Inc. Fluid and laser system
US20070014322A1 (en) * 1995-08-31 2007-01-18 Biolase Technology, Inc. Electromagnetic energy distributions for electromagnetically induced mechanical cutting
US20090143775A1 (en) * 1995-08-31 2009-06-04 Rizoiu Ioana M Medical laser having controlled-temperature and sterilized fluid output
US20090281531A1 (en) * 1995-08-31 2009-11-12 Rizoiu Ioana M Interventional and therapeutic electromagnetic energy systems
US20100233645A1 (en) * 1997-12-05 2010-09-16 Biolase Technology, Inc. Efficient laser and fluid conditioning and cutting system
US6558372B1 (en) * 1998-01-23 2003-05-06 Gregory B. Altshuler Method for treating materials, especially biological tissues, using light induction and device for realizing the same
US7048731B2 (en) 1998-01-23 2006-05-23 Laser Abrasive Technologies, Llc Methods and apparatus for light induced processing of biological tissues and of dental materials
US6605651B1 (en) 1998-09-09 2003-08-12 Biomat Sciences, Inc. Curing methods and material compositions having dental and other applications
US7004755B2 (en) * 1998-09-18 2006-02-28 Marc Seghatol Hand-held microwave intra-oral dental system
US20050011885A1 (en) * 1998-09-18 2005-01-20 Marc Seghatol Hand-held microwave polymerization system for dentistry
US20040214132A1 (en) * 1999-04-16 2004-10-28 Altshuler Gregory B Apparatus and method for the processing of solid materials, including hard tissues
US6254389B1 (en) * 1999-09-20 2001-07-03 Marc Seghatol Hand-held microwave intra-oral dental system
US6709269B1 (en) * 2000-04-14 2004-03-23 Gregory B. Altshuler Apparatus and method for the processing of solid materials, including hard tissues
US9162078B2 (en) 2000-10-20 2015-10-20 Mela Sciences, Inc. Treatment of skin disorders with UV light
US7886749B2 (en) * 2000-10-20 2011-02-15 Photomedex Treatment of skin disorders with UV light and cooling
US8486056B2 (en) 2000-10-20 2013-07-16 Photomedex Treatment of skin disorders with UV light
US20060276862A1 (en) * 2000-10-20 2006-12-07 Irwin Dean S Treatment of skin disorders with UV light and cooling
US20050015124A1 (en) * 2000-10-20 2005-01-20 Irwin Dean S. Treatment of skin disorders with UV light and cooling
US20070282402A1 (en) * 2000-10-20 2007-12-06 Photomedex Treatment of skin disorders with uv light and cooling
US7276059B2 (en) * 2000-10-20 2007-10-02 Photomedex Treatment of skin disorders with UV light and cooling
US20080157690A1 (en) * 2001-05-02 2008-07-03 Biolase Technology, Inc. Electromagnetic energy distributions for electromagnetically induced mechanical cutting
US20040188400A1 (en) * 2001-09-10 2004-09-30 Micron Technology, Inc. Wafer dicing device and method
US8115306B2 (en) 2001-10-08 2012-02-14 Round Rock Research, Llc Apparatus and method for packaging circuits
US20100140794A1 (en) * 2001-10-08 2010-06-10 Chia Yong Poo Apparatus and method for packaging circuits
US20050177208A1 (en) * 2001-10-18 2005-08-11 Irwin Dean S. Device for oral UV photo-therapy
US20110196457A1 (en) * 2001-10-18 2011-08-11 Photomedex Device for uv photo-therapy
US8454669B2 (en) 2001-10-18 2013-06-04 Photomedex Device for UV photo-therapy
US7891361B2 (en) 2001-10-18 2011-02-22 Photomedex Methods for UV photo-therapy
US7144248B2 (en) * 2001-10-18 2006-12-05 Irwin Dean S Device for oral UV photo-therapy
US20080288032A1 (en) * 2001-10-18 2008-11-20 Photomedex Device for UV photo-therapy
US8348933B2 (en) 2002-04-09 2013-01-08 Laser Abrasive Technologies, Llc Method and apparatus for processing hard material
US20080003536A1 (en) * 2002-04-09 2008-01-03 Altshuler Gregory B Method and apparatus for processing hard material
US7267672B2 (en) * 2002-04-09 2007-09-11 Gregory B. Altshuler Method and apparatus for processing hard material
US20080021441A1 (en) * 2002-04-09 2008-01-24 Altshuler Gregory B Method and apparatus for processing hard material
US20040030326A1 (en) * 2002-04-09 2004-02-12 Altshuler Gregory B. Method and apparatus for processing hard material
US7632264B2 (en) * 2002-06-10 2009-12-15 Olaf Schafer Medical tools for dental treatments by means of a laser
US20050170310A1 (en) * 2002-06-10 2005-08-04 Olaf Schafer Medical tools for dental treatments by means of a laser
US20110018143A1 (en) * 2002-06-14 2011-01-27 Swee Kwang Chua Wafer level packaging
US8564106B2 (en) 2002-06-14 2013-10-22 Micron Technology, Inc. Wafer level packaging
US8106488B2 (en) 2002-06-14 2012-01-31 Micron Technology, Inc. Wafer level packaging
US8535359B2 (en) 2002-08-28 2013-09-17 Nomir Medical Technologies, Inc. Near infrared microbial elimination laser systems (NIMELS)
US20040156743A1 (en) * 2002-08-28 2004-08-12 Eric Bornstein Near infrared microbial elimination laser system
US20090105790A1 (en) * 2002-08-28 2009-04-23 Nomir Medical Technologies, Inc. Near Infrared Microbial Elimination Laser Systems (NIMELS)
US7713294B2 (en) 2002-08-28 2010-05-11 Nomir Medical Technologies, Inc. Near infrared microbial elimination laser systems (NIMEL)
US20040170060A1 (en) * 2003-02-27 2004-09-02 Renesas Technology Corp. Semiconductor storage device preventing data change due to accumulative disturbance
US20040221451A1 (en) * 2003-05-06 2004-11-11 Micron Technology, Inc. Method for packaging circuits and packaged circuits
US8555495B2 (en) 2003-05-06 2013-10-15 Micron Technology, Inc. Method for packaging circuits
US9484225B2 (en) 2003-05-06 2016-11-01 Micron Technology, Inc. Method for packaging circuits
US20100146780A1 (en) * 2003-05-06 2010-06-17 Yong Poo Chia Method for packaging circuits and packaged circuits
US8065792B2 (en) 2003-05-06 2011-11-29 Micron Technology, Inc. Method for packaging circuits
US7712211B2 (en) 2003-05-06 2010-05-11 Micron Technology, Inc. Method for packaging circuits and packaged circuits
US20080138764A1 (en) * 2003-05-09 2008-06-12 Rizoiu Ioana M Fluid and laser system
CN100588439C (en) 2003-08-26 2010-02-10 诺米尔医疗技术公司 Near infrared microbial elimination laser system
WO2005087317A1 (en) * 2003-08-26 2005-09-22 Eric Bornstein Near infrared microbial elimination laser system
US20050123490A1 (en) * 2003-12-04 2005-06-09 Kazue Yamagishi Composition and method for prevention and treatment of dental caries
US20100151406A1 (en) * 2004-01-08 2010-06-17 Dmitri Boutoussov Fluid conditioning system
WO2005070151A3 (en) * 2004-01-08 2005-10-20 Biolase Tech Inc Electromagnetic energy distributions for electromagnetically induced mechanical cutting
WO2005070151A2 (en) 2004-01-08 2005-08-04 Biolase Technology, Inc. Electromagnetic energy distributions for electromagnetically induced mechanical cutting
WO2006015153A3 (en) * 2004-07-27 2007-03-01 Biolase Tech Inc Medical laser having controlled-temperature and sterilized fluid output
US20060126680A1 (en) * 2004-07-27 2006-06-15 Dmitri Boutoussov Dual pulse-width medical laser
US7957440B2 (en) 2004-07-27 2011-06-07 Biolase Technology, Inc. Dual pulse-width medical laser
US7970030B2 (en) 2004-07-27 2011-06-28 Biolase Technology, Inc. Dual pulse-width medical laser with presets
US20080212624A1 (en) * 2004-07-27 2008-09-04 Biolase Technology, Inc. Dual pulse-width medical laser
US20090141752A1 (en) * 2004-07-27 2009-06-04 Rizoiu Ioana M Dual pulse-width medical laser with presets
US20060142743A1 (en) * 2004-07-27 2006-06-29 Rizoiu Ioana M Medical laser having controlled-temperature and sterilized fluid output
EP1778117A2 (en) * 2004-07-27 2007-05-02 BioLase Technology, Inc. Medical laser having controlled-temperature and sterilized fluid output
EP1778117A4 (en) * 2004-07-27 2012-10-03 Biolase Tech Inc Medical laser having controlled-temperature and sterilized fluid output
US7630420B2 (en) 2004-07-27 2009-12-08 Biolase Technology, Inc. Dual pulse-width medical laser
US20060021977A1 (en) * 2004-07-30 2006-02-02 Menegus Harry E Process and apparatus for scoring a brittle material incorporating moving optical assembly
US20060033963A1 (en) * 2004-08-10 2006-02-16 Hirobumi Nishida Image processing device, image processing method, image processing program, and recording medium
US20060142745A1 (en) * 2004-08-13 2006-06-29 Dmitri Boutoussov Dual pulse-width medical laser with presets
US20060189091A1 (en) * 2004-11-11 2006-08-24 Bo Gu Method and system for laser hard marking
US20090319008A1 (en) * 2005-03-31 2009-12-24 Esther Mayer Probe device, system and method for photobiomodulation of tissue lining a body cavity
US20070265605A1 (en) * 2006-05-15 2007-11-15 Light Instruments Ltd. Apparatus and method for treating dental tissue
US20080032251A1 (en) * 2006-07-19 2008-02-07 Mau-Song Chou Laser carious region ablation
US8500447B2 (en) * 2008-10-10 2013-08-06 W&H Dentalwerk Bürmoos GmbH Medical handpiece with pulsed illumination
US20100092908A1 (en) * 2008-10-10 2010-04-15 W&H Dentalwerk Burmoos Gmbh Medical handpiece with pulsed illumination
US8485818B2 (en) 2009-12-04 2013-07-16 Biolase, Inc. Fluid controller
US20130216972A1 (en) * 2010-07-22 2013-08-22 Laszlo Kolozsvary Process and apparatus for computer-controlled preparation of teeth
US20140030671A1 (en) * 2011-06-01 2014-01-30 Hamamatsu Photonics K.K. Dental therapy apparatus
US9408673B2 (en) 2011-09-02 2016-08-09 Convergent Dental, Inc. Laser based computer controlled dental preparation system
US9539057B2 (en) 2012-04-26 2017-01-10 J. Morita Manufacturing Corporation Laser irradiation tip, laser irradiation handpiece, laser treatment apparatus, and laser irradiation tip end member
US9011417B2 (en) 2012-05-14 2015-04-21 Convergent Dental, Inc. Apparatus and method for controlled fluid cooling during laser based dental treatments
US9011416B2 (en) 2012-05-14 2015-04-21 Convergent Dental, Inc. Apparatus and method for controlled fluid cooling during laser based dental treatments
US20150374471A1 (en) * 2013-02-01 2015-12-31 Biomat Sciences Method and device for treating caries using locally delivered microwave energy
US20150140504A1 (en) * 2013-11-19 2015-05-21 Sirona Dental Systems Gmbh Soft-tissue laser surgery

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